I just checked Chat online at it's working fine, did you press the right buttons or are you using a browser that doesn't completely work with this web-site?
Look, you've got press the "How to get in touch" button then select in the Live Chat options that appear, which is TV or Broadband & Calls and finally click Chat online, it does work and they're not busy at the moment.
@Anonymous User near the bottom, little blue down arrow. Click it, select broadband or TV (whichever is relevant) and then the button should go green. Click it to open chat.
@Anonymous User things to try of you can't get through to live chat
Power down the NowTV box and your router, wait one minute and then turn your router back on. Once the router has done a complete start up turn on the NowTV box and see if it finds the network.
If it doesn't, go to settings, network settings and register the device in your network again. Make sure you've correctly selected wireless or Ethernet depending on what you use.